Electric fan



FIG. 1 is a front, top and right-side perspective view of an electric fan showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a right-side view thereof;

FIG. 7 is a left-side view thereof; and,

FIG. 8 is a rear, top and left-side perspective view thereof.

The broken lines shown represent portions of the electric fan and form no part of the claimed design. 

CLAIM The ornamental design for an electric fan, as shown and described. 